Reciprocating machine.



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UNITED STATES PATENT GEEICE.

JAMES PECKOVER, OF PHILADELPHIA, PENNSYLVANIA.

REclPRooA-rlNc MACHINE.

.SPECIFICATION forming part of Letters Patent No. 690,316, dated December 31, 1901.

Application filed July 18, 1900..

To all whom t mayconccrn.-

Be it known that I, JAMES PECKOVER, residing at Philadelphia, State of Pennsylvania, have invented new and useful Improvements in Stone-Sawing Machines, of which the following is a specification.

My invention relates to certain improvements in stone-sawing mechanism, and more particularly to improvements in the construction and arrangement of Vthe detail parts thereof.

One object of my invention is to provide means whereb)T a machine of the type described may more quickly and efficiently per'- form its work, a further object being to prov vide protection for the parts liable to injury from the action of' grit or other foreign substances. These objects I attain as hereinafter set forth, reference being had to the accompanying drawings, in which- Figure l is a plan view of Vsufficient of a stone-sawing machine, illustrating my invention. Fig. 2 is a longitudinal sectional view of the same, taken on the line 2 2, Fig. l. Fig. 3 is a transverse sectional view on the line 3 3, Fig. 1. Fig. 4 is an enlarged longitudinal sectional view of part of the carrier-frame. Fig. 6 is an enlarged transverse sectional view of the same, and Fig 6 is a View of a modification of the device'for slightly raising the sawframe at the end of each stroke.

In the drawings, A A are the posts or main supports of the main frame of a machine to which my invention is applied, having secured to -them vertical screws a a, which are journaled and operated to raise or lower the sawing mechanism in any of the various Ways known to the art. Threaded on theseserews are nuts a' a', each with a ipivot projecting from it, to which are hung the pendent rods ce2 a2. Connected to these rods is a carrierframe consisting of elongated .box-like sideL members B and end members B', these latter being rods or bars on which are distance-nuts b. b and retaining-nuts b2 b2. As will be seen from Figs. Sand 5, the side members B are preferably made of two channel-irons b b,

2 placed. with their iianges facing and held toserial No. 24,012. cto model.)

these box-like side members B. Pieces b4, held to the channel-irons by bolts b5, have attached to them the slides or bearing-surfaces b, in which are recesses holding glass disks 57. These latter are convex on their upper sides and hat on their lower surfaces and are embedded in Babbitt metal to the level of their top surfaces.

Rollers c c, for a purpose set forth hereinafter, are fitted to bearings in the pieces b4, and they also serve as distance-pieces to prevent any tendency of the channel-irons b b to close the slot betweentheir lower Iianges.

A saw-frame is hung from the above-described carrier-frame by four runners d d, which are preferably made of sections of I- beams with the under faces of their'upper' anges finished to run smoothly on the slides b, the said slides being sloped to accommodate the inclination of the runner-flanges. The saw-f rame itself consists of end members D D, each consisting of a pairof channels bolted together back to back, preferably with `a plate between them, the two members being joined by the saws d4 d4, of which there are two in the present instance, these being bolted to the end members of the frame and operating in the kerfs d3 d3 of a stone, as shown.l the web of each runner d, and the square upper corner of each recess is cut off diagonally, as plainly shown in Fig. 4.

E is a pedestal having across its upper part a bar e,- to which is pivoted one end of the rods e' e', their other ends being connected to the carrier-frame by its end members B. The pedestal also has bearings in it for the support of the driving-shaft 2, the latter be- Recesses d2 are cut in the ends of ing connected to any suitable source ot' power.

There is a crank e3 on this shaft, and a connecting-rod c4 extends between it and the end of the saw-frame.

In operation as the shaft c2 is rotated the revolution of the crank reciprocates the saw- IOO kerfs. Near the end of each stroke the runners come in contact with one set of rollers c c and the continued motion of the connecting-rod compelling the saw-frame to move farther toward said rollers, the diagonally cut edge and then the straight edge of the recess d2 in the webs of the runners, rides up on the same. This bodily lifts the sawframe and with it the saws, the whole being held in this position until the connecting-rod begins to move in the opposite direction, when the runners slide off the rollers and drop the saws quite heavily upon the bottom or floor of the kerfs, the whole operation being similarly repeated at the other end of the stroke. When the saw-frame is lifted at the end of each stroke, the water and abrading material is allowed to get underneath the sawblades, and these latter are permitted to regain their normal shape, it being generally the case that they Warp during the stroke. By thus avoiding this objectionable warping of the saws the stone is cut by much straighter kerfs than would otherwise be formed andl considerable expense is saved, since comparatively little working over of the slabs is required .When the cutting is iinished. 'Agairn when the saws are droppedinto the kerfs as the runners slide on. the rollers at the beginning of each stroke .the abrading material which has run under the saws while they were elevated is pounded into the stone, thus materially hurrying its-disintegration in the line cut and materially aiding the sawing thereof.

It will be understood that I do not confine myself solely to the use of rollers for lifting the saw-frame, as, if desired, I may use an obstacle of the form shown at c3, Fig. 6.

It has been found that glass, by combining both smoothness and hardness, makes a very valuable antifriction material for the runandother foreign injurious matter is kept oif of these very delicate parts of the machine, their Vlife being greatly prolonged thereby and the cost of maintenance correspondingly reduced.

In order that as the depth of the saw cuts or kerfs increases the saw-frame and carrierframe may retain the same position relatively to one another, the bar e', by which the said carrier-frame is anchored, is made the same length as the connecting-rod. By this means the'pivotal points of the two frames or the points at which they are connected to the rods'e and e4, respectively, are made to describe similar arcs around the points of revolution e and e2 as the saw cuts through the stone, and are consequently made to operate in the most advantageous manner.

I claim as my inventionl. The combination in a stone-cutting machine, of a supporting-frame, a carrier-frame supported thereon, slides inclosed on all sides within said carrier-frame, and a saw-frame having runners projecting through an opening in the lower face of the carrier-frame constructed to operate on said slides, with means for reciprocating the saw-frame, substantially as described.

2. The combination in a stone-cutting machine, of a main frame, acarrier-frame hung therefrom, said carrier frame having side members composed of slides inclosed in an elongated box-like structure, a saw -frame having runners constructed tooperate on said inclosed slides, the runners entering said inclosed structure through relatively narrow slots' in the carrier-frame, with means for reciprocating the saw-frame, substantially as described.

3. In a stone-sawing machine, the combination of a main frame, a carrier-frame hung therefrom having box-like side members, a saw-frame with saws constructed to be reciprocated while being supported from the carrier-frame, slides within the side members of the carrier-frame and runners on the sawframe entering slots in the bottom faces of the side members on the carrier-frame and bearing upon the said slides, with means on the carrier-frame for lifting the saw-frame at the end of each stroke and means for reciprocating the saw-frame, substantially as described. l

Il. The combination in a stone-sawing machine, of a main frame, a carrier-frame hung therefrom, said carrier-frame consisting of two hollow elongated side members having slides therein, and a slot opening into them, said members being held together by two end members, a saw-frame having runners projecting through the slots in the side members of the carrier-frame, and constructed to operate'on the slides, with means independent of the slides for raising and afterward dropping the sawframe as it nears the end of each stroke, substantially as described.

5. The combination in a stone-cutting machine, of a main frame, a carrier-frame hung therefrom and having inclosed slides, a relatively narrow slot in said carrier-frame opening into the inclosed slides, pieces in the slot extending from side to side thereof, a sawframe having runners entering the slot and operating on said slides, means for reciprocating the saw-frame, said runners with said frame being constructed to be raised when brought into engagement with said pieces in the slots, substantially as described.

6. The combination in a stone-cutting machine, of a main frame, a carrier-frame hung therefrom constructed with inclosed slides, a relatively narrow slot in said carrier-frame opening into said slides, rollers supported in IOO IIC:

said slot with their axes of revolution at right angles to the length of the slots, a saw-frame having runners entering the slot and operating on the slides, means for reciprocating the saw-frame, the runners with their attached frame being constructed to be raised when brought into engagement with the said rollers, substantially as described.

7. In a stone-sawing machine, the combination of a main frame, a carrier-frame hung therefrom, slides on said carrier-frame, a sawframe having runners, each of said runners consisting of ahead-section connected to the saw-frame by a web-section, the under side of said head-section bearing on said slides, with means for reciprocating the saw-frame, substantially as described.

8. In a stone-cutting machine,'the combination of a main frame, a carrier-frame hung thereby alternately raise and lower the sawframe at certain points of itsstroke as the machine operates, substantially as described.

In testimony whereof I have signed my name to this specification in the presence of two subscribing witnesses.

JAMES PECKOVER.

Witnesses f CARRIE OBRIEN, BELLA OBRIEN. 

